package com.xing.commonutils;

import io.jsonwebtoken.*;
import org.springframework.util.StringUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.Date;

/**
 * java web token 按照官方通用的规则生成一定的字符串
 *
 * @author: xingfuhao
 * @create: 2022-03-24 20:52
 */

public class JwtUtils {

    //过期时间
    public static final long EXPIRE =1000 * 60 *60 * 24;
    //密钥
    public static final String  APP_SECRET ="ukc8BDbRigUDaY6pZFfWus2jZWLPHO";

    public static String getJwtToken(String id,String nickname){
        String JwtToken = Jwts.builder()
                .setHeaderParam("typ", "JWT")
                .setHeaderParam("alg", "HS256")
                .setSubject("xfh-user")
                .setIssuedAt(new Date())
                .setExpiration(new Date(System.currentTimeMillis()+EXPIRE))
                .claim("id",id)
                .claim("nickname", nickname)
                .signWith(SignatureAlgorithm.HS256,APP_SECRET)
                .compact();

        return JwtToken;
    }

    /**
     * 判断token是否存在有效
     * @param jwtToken
     * @return
     */
    public static boolean checkToken(String jwtToken){

        if(StringUtils.isEmpty(jwtToken)){
            return false;
        }
        try {
            Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }

    /**
     * 判断token是否存在和有效
     * @param request
     * @return
     */
    public static boolean checkToken(HttpServletRequest request){
        try {
            String jwtToken=request.getHeader("token");
            if(StringUtils.isEmpty(jwtToken)){
                return false;
            }
            Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }

    /**
     * 根据token生成会员id
     * @param request
     * @return
     */
    public static String getMemberIdByJwtToken(HttpServletRequest request){

        String jwtToken=request.getHeader("token");
        if(StringUtils.isEmpty(jwtToken)){
            return "";
        }
        Jws<Claims> claimsJws = Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);
        Claims claims = claimsJws.getBody();
        return (String)claims.get("id");

    }
}
